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When a node joins the cluster (before/after key rotation), it receives the current encryption keys for the cache groups used for writing (it "rotates" encryption key automatically).
If the encryption key is a new key, then the node sets it for writing and starts the background re-encryption process (it starts re-encryption automatically).
Therefore, a node may leave the cluster during a key change, or a node may be absent and rejoin later (it does not matter if the baseline changes or not).

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